A method and system for equivalent fitting of rail transit stray current

Abstract

A method and system for equivalent fitting of rail transit stray current, the method comprising: building a rail transit basic simulation model based on CDEGS software; according to the basic simulation model, simulating and calculating the maximum step length of the train according to a first preset rule; according to the maximum step length of the train, fitting the stray current within the step length according to a second preset rule. The present invention can perform equivalent fitting of the stray current at any position on the rail transit rail, and under the premise of meeting the calculation accuracy, it can greatly save the calculation workload, improve the quality and efficiency of the simulation, and provide a theoretical basis for the analysis and management of stray currents.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transit stray current, and in particular to a method for equivalent fitting of rail transit stray current. Background Art

[0002] The single-pole operation of ultra-high and extra-high voltage DC projects, urban rail transit operation, photovoltaic, wind power, DC distribution networks, etc. will all generate DC components. The DC components flow in urban pipe corridors, energy pipe corridors and power grids, and flow into transformers, causing DC magnetic bias in transformers and transformer vibration, which not only shortens the life of transformers and endangers the safety of large power grid operations, but also causes noise disturbances, leading to complaints from nearby residents and affecting the social image of power grid companies.

[0003] The simulation model of stray current distribution of urban rail transit based on CDEGS software has been recognized and widely used by experts and scholars because it can well equivalent the metal structure of the line and the line operation environment. The prior art proposes a fast modeling method for substation grounding grid suitable for CDEGS, which is as follows: according to the conductor parameters and burial depth in the substation grounding grid design standard, the actual measured substation size, grounding grid grounding resistance and soil resistivity, the grounding resistance calculation formula is used to calculate the initial size of the equivalent grounding grid grid, an equivalent grounding grid is established in the CDEGS software, its grounding resistance is calculated by the software, and the grid size of the equivalent grounding grid is changed to make its grounding resistance approach the actual value, thereby obtaining the conductor structure of the equivalent grounding grid that meets the actual grounding resistance. The prior art also proposes a simulation calculation method for stray current of urban rail transit based on CDEGS, specifically: according to the topological structure of the urban rail transit line, the structural topology of the simulation model of the leakage current of the urban rail transit is established by using the CDEGS software, and based on the unit length resistance of the contact line, the track system parameters, the drainage system parameters, the locomotive system parameters, the traction substation parameters and other parameters, the relevant parameters in the simulation model of the leakage circuit of the urban rail transit are set to build a simulation model of the leakage current of the urban rail transit; the model is simulated by the CDEGS software to obtain the leakage current of the rail, and the stray current in the urban rail transit system is obtained by calculating and processing the leakage current.

[0004] However, when using CDEGS software for simulation, especially when the soil is multi-layered, the simulation time is very long. In the scenario of simulating train movement, the simulation is very time-consuming and labor-intensive, which seriously affects the quality and efficiency of the simulation. Therefore, a method for equivalent fitting of stray current is urgently needed. Through the existing simulation results of CDEGS, the stray current at any position can be fitted, which can reduce the number and duration of simulation and improve the quality and efficiency of simulation. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide a method and system for equivalent fitting of rail transit stray currents that overcome the above problems or at least partially solve the above problems.

[0006] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention discloses a method for equivalent fitting of rail transit stray current, comprising:

[0008] S100. Build a basic rail transit simulation model based on CDEGS software;

[0009] S200. According to the basic simulation model, the maximum step length of the train is calculated by simulation according to the first preset rule;

[0010] S300. According to the maximum step length of the train, fit the stray current within the step length according to a second preset rule.

[0011] Furthermore, in S100, a basic simulation model of rail transit is built based on the MALZ module of CDEGS software, and the basic simulation model at least includes a conductor model, a substation grounding grid model, a transformer model, a contact network model, a rail model, a drainage network model, a traction station model and a train model.

[0012] Furthermore, in the traction station model and the train model, the traction station shares a busbar, each train has a busbar, and the excitation of the traction station is equal to the sum of the excitations of all trains, but in opposite directions.

[0013] Further, in S200, according to the basic simulation model, the maximum step length of the train is simulated and calculated according to a first preset rule, and the first preset rule at least includes:

[0014] S201. Obtain the number n of subway lines in the basic simulation model, wherein each subway line has a rail for an up line and a rail for a down line, and there are 2n rails in total, denoted as {G1, G2, ..., G 2n}, the rail length is recorded as {L1,L2,…,L 2n}, for any rail G i , 1≤i≤2n, the train movement step length is C;

[0015] S202. Obtain the maximum number of trains on 2n rails, denoted as {m1,m2,…,m 2n}, then for any rail, the relationship m i C≤L i , completing the setting of all trains on the rails according to the relationship;

[0016] S203. After all trains are set up on the rails, four verification intervals [J1, J2, J3, J4] are determined. For rail G i , if the positive maximum value appears at position p and the negative maximum value appears at position q, then the trains corresponding to the four verification intervals [J1, J2, J3, J4] are [p-1, p], [p, p+1], [q-1, q], [q, q+1] respectively, and the stray currents at the corresponding positions are divided into A p-1 , A p , A p+1 , A q-1 , A q , A q+1 ;

[0017] S204. Set the position of the conductor simulation train at intervals of preset lengths in the four verified sections. The conductor corresponding to section J1 is The conductor corresponding to the interval J2 is The conductor corresponding to the interval J3 is The conductor corresponding to the interval J4 is in

[0018] S205. After the conductor is set, the stray current is calculated and the stray currents of the four sections are obtained as follows: The error between the fitted value and the true value of each interval is calculated based on the stray current of the four intervals.

[0019] S206. Based on the error between the fitting value and the true value Get the maximum step size of the train.

[0020] Furthermore, in S205, the error between the fitting value and the true value The calculation formula includes:

[0021]

[0022] Among them, A p-1 , A p , A p+1 , A q-1 , A q , A q+1 are the stray currents at the positions of [p-1, p], [p, p+1], [q-1, q], [q, q+1] corresponding to the trains in the intervals [J1, J2, J3, J4], respectively. C is the train movement step length, and D 1,i , D 2,i , D 3,i and D 4,i They are the conductors corresponding to the intervals J1, J2, J3 and J4 respectively.

[0023] Further, in S206, according to the error between the fitting value and the true value The maximum step length of the train is obtained by: The error threshold YZ between the fitted value and the true value of the simulation is used to judge. If it satisfies Where YZ is the error threshold between the fitted value and the true value of the simulation, then the maximum step length C max =C, then set C=C+1, and then repeat the above S202-S205;

[0024] If not satisfied Then determine whether the maximum step length is empty. If it is not empty, end the calculation, C min That is the maximum step length; when the maximum step length is empty, let C=C-1, and then repeat S202-S205 until the maximum step length is obtained.

[0025] Further, according to the maximum step length of the train, the stray current within the step length is fitted according to a second preset rule, and the specific method of the second preset rule includes: obtaining the maximum step length C of the train max And verification interval segment, when the verification interval segment is [p, p+1], the calculation formula of the stray current at any point within the step size is:

[0026]

[0027] Among them A j is the current of any point j in the interval [p, p+1], S is the distance from point j to position p in the interval, The maximum step length C max The stray current at positions p and p+1.

[0028] In a second aspect, an embodiment of the present invention discloses a system for equivalent fitting of rail transit stray current, comprising: a rail transit basic simulation model building unit, a train maximum step length calculation unit and a stray current fitting unit; wherein:

[0029] Rail transit basic simulation model building unit, used to build rail transit basic simulation model based on CDEGS software;

[0030] A train maximum step length calculation unit, used for simulating and calculating the train maximum step length according to the basic simulation model and a first preset rule;

[0031] The stray current fitting unit is used to fit the stray current within the step length according to the maximum step length of the train and a second preset rule.

[0032] Furthermore, the first preset rule at least includes:

[0033] S201. Obtain the number n of subway lines in the basic simulation model, wherein each subway line has a rail for an up line and a rail for a down line, and there are 2n rails in total, denoted as {G1, G2, ..., G 2n}, the rail length is recorded as {L1,L2,…,L 2n}, for any rail G i , 1≤i≤2n, the train movement step length is C;

[0034] S202. Obtain the maximum number of trains on 2n rails, denoted as {m1,m2,…,m 2n}, then for any rail, the relationship m i C≤L i , completing the setting of all trains on the rails according to the relationship;

[0035] S203. After all trains are set up on the rails, four verification intervals [J1, J2, J3, J4] are determined. For rail G i , if the positive maximum value appears at position p and the negative maximum value appears at position q, then the trains corresponding to the four verification intervals [J1, J2, J3, J4] are [p-1, p], [p, p+1], [q-1, q], [q, q+1] respectively, and the stray currents at the corresponding positions are divided into A p-1 , A p , A p+1 , A q-1 , A q , A q+1 ;

[0036] S204. Set the position of the conductor simulation train at intervals of preset lengths in the four verified sections. The conductor corresponding to section J1 is The conductor corresponding to the interval J2 is The conductor corresponding to the interval J3 is The conductor corresponding to the interval J4 is in

[0037] S205. After the conductor is set, the stray current is calculated and the stray currents of the four sections are obtained as follows: The error between the fitted value and the true value of each interval is calculated based on the stray current of the four intervals.

[0038] S206. Based on the error between the fitting value and the true value Get the maximum step size of the train.

[0039] In a third aspect, an embodiment of the present invention discloses an electronic device, including:

[0040] one or more processors;

[0041] A memory for storing one or more programs;

[0042] When the one or more programs are executed by the one or more processors, the one or more processors implement the method for automatic slag skimming control of molten iron.

[0043] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0044] The present invention discloses a method and system for equivalent fitting of rail transit stray current, the method comprising: building a rail transit basic simulation model based on CDEGS software; according to the basic simulation model, simulating and calculating the maximum step length of the train according to a first preset rule; according to the maximum step length of the train, fitting the stray current within the step length according to a second preset rule. The present invention can perform equivalent fitting of the stray current at any position on the rail of rail transit, and under the premise of satisfying the calculation accuracy, it can greatly save the calculation workload, improve the quality and efficiency of the simulation, and provide a theoretical basis for the analysis and management of stray currents.

[0045] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0047] Figure 1 This is a flow chart of a method for equivalent fitting of rail transit stray current in embodiment 1 of the present invention;

[0048] Figure 2 This is a flow chart of train coordinate position calculation in Example 1 of the present invention.

[0049] Figure 3 This is a schematic diagram of the structure of an electronic device in Example 3 of the present invention. DETAILED DESCRIPTION

[0050] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0051] In order to solve the problems existing in the prior art, an embodiment of the present invention provides a method and system for equivalent fitting of stray current in rail transit.

[0052] Example 1

[0053] The present invention discloses a method for equivalent fitting of rail transit stray current, such as Figure 1 ,include:

[0054] S100. Build a basic simulation model of rail transit based on CDEGS software; In S100 of this embodiment, a basic simulation model of rail transit is built based on the MALZ module of CDEGS software, and the basic simulation model at least includes a conductor model, a substation grounding network model, a transformer model, a contact network model, a rail model, a drainage network model, a traction station model, and a train model. In the traction station model and the train model, the traction station shares a busbar, each train has a busbar, and the excitation of the traction station is equal to the sum of the excitations of all trains, but in the opposite direction.

[0055] Specifically, CDEGS is the abbreviation of the first letters of the English initials of Current Distribution, Electromagnetic Fields, Grounding and Soil Structure Analysis. It is a powerful tool software for solving engineering problems such as power system grounding, electromagnetic fields and electromagnetic interference, and can solve problems such as cathodic protection. The software contains multiple engineering application modules, among which the MALZ module is a tool specifically used to analyze the current distribution, electromagnetic fields and grounding systems of underground and above-ground power systems. The MALZ module of CDEGS software is used to build a basic simulation model of rail transit.

[0056] S200. According to the basic simulation model, the maximum step length of the train is simulated and calculated according to the first preset rule; in S200 of this embodiment, according to the basic simulation model, the maximum step length of the train is simulated and calculated according to the first preset rule, and the first preset rule at least includes:

[0057] S201. Obtain the number n of subway lines in the basic simulation model, wherein each subway line has a rail for an up line and a rail for a down line, and there are 2n rails in total, denoted as {G1, G2, ..., G 2n}, the rail length is recorded as {L1,L2,…,L 2n}, for any rail G i , 1≤i≤2n, the train movement step length is C;

[0058] S202. Obtain the maximum number of trains on 2n rails, denoted as {m1,m2,…,m 2n}, then for any rail, the relationship m i C≤L i , completing the setting of all trains on the rails according to the relationship;

[0059] S203. After all trains are set up on the rails, four verification intervals [J1, J2, J3, J4] are determined. For rail G i , if the positive maximum value appears at position p and the negative maximum value appears at position q, then the trains corresponding to the four verification intervals [J1, J2, J3, J4] are [p-1, p], [p, p+1], [q-1, q], [q, q+1] respectively, and the stray currents at the corresponding positions are divided into A p-1 , A p , A p+1 , A q-1 , A q , A q+1 ;

[0060] S204. Set the position of the conductor simulation train at intervals of preset lengths in the four verified sections. The conductor corresponding to section J1 is The conductor corresponding to the interval J2 is The conductor corresponding to the interval J3 is The conductor corresponding to the interval J4 is in

[0061] S205. After the conductor is set, the stray current is calculated and the stray currents of the four sections are obtained as follows: The error between the fitting value and the true value of each interval is calculated based on the stray current of the four intervals.

[0062] S206. Based on the error between the fitting value and the true value Get the maximum step size of the train.

[0063] Among them, in S205 of some preferred embodiments, the error between the fitting value and the true value is The calculation formula includes:

[0064]

[0065] Among them, A p-1 , A p , A p+1 , A q-1 , A q , A q+1are the stray currents at the positions of [p-1, p], [p, p+1], [q-1, q], [q, q+1] corresponding to the trains in the intervals [J1, J2, J3, J4], respectively. C is the train movement step length, and D 1,i , D 2,i , D 3,i and D 4,i They are the conductors corresponding to the intervals J1, J2, J3 and J4 respectively.

[0066] In S206 of some preferred embodiments, according to the error between the fitting value and the true value Get the maximum step length of the train, such as Figure 2 , the specific method includes: the error of the true value The error threshold YZ between the fitted value and the true value of the simulation is used to judge. If it satisfies Where YZ is the error threshold between the fitted value and the true value of the simulation, then the maximum step length C max =C, then set C=C+1, and then repeat the above S202-S205;

[0067] If not satisfied Then determine whether the maximum step length is empty. If it is not empty, end the calculation, C min That is the maximum step length; when the maximum step length is empty, let C=C-1, and then repeat S202-S205 until the maximum step length is obtained.

[0068] S300. According to the maximum step length of the train, the stray current within the step length is fitted according to the second preset rule. Specifically, according to the maximum step length of the train, the stray current within the step length is fitted according to the second preset rule. The specific method of the second preset rule includes: obtaining the maximum step length C of the train max And verification interval segment, when the verification interval segment is [p, p+1], the calculation formula of the stray current at any point within the step size is:

[0069]

[0070] Among them A j is the current of any point j in the interval [p, p+1], S is the distance from point j to position p in the interval, The maximum step length C max The stray current at positions p and p+1.

[0071] It can be understood that when the verification interval is the other three intervals [p-1, p], [q-1, q], [q, q+1], the starting point of the interval in the above formula is replaced, and it is agreed that the stray current at any point within the other three interval steps can be obtained.

[0072] In order to better understand the present embodiment, the technical solution and effects of the present invention are described in detail with a specific embodiment below:

[0073] Build a basic simulation model of multi-source DC components; according to the built basic simulation model, the maximum step length of the train is obtained to be 50m through simulation calculation;

[0074] According to the maximum step size obtained, the stray current in the 50m interval is fitted. It is known that the stray current at position p in the interval [p, p+1] is -0.0253A, and the stray current at position p+1 is -0.03636A. The fitting values ​​and true values ​​of the four positions in the interval are shown in the following table. It can be seen from the table that the error is very small.

[0075] Location Fitted values True value error 1 -0.027512 -0.02754 -0.102％ 2 -0.029724 -0.02975 -0.0874％ 3 -0.031936 -0.03196 -0.0751％ 4 -0.034148 -0.03417 -0.0644％

[0076] The present embodiment discloses a method and system for equivalent fitting of rail transit stray current, the method comprising: building a rail transit basic simulation model based on CDEGS software; according to the basic simulation model, simulating and calculating the maximum step length of the train according to a first preset rule; according to the maximum step length of the train, fitting the stray current within the step length according to a second preset rule. The present invention can perform equivalent fitting of the stray current at any position on the rail transit rail, and under the premise of satisfying the calculation accuracy, it can greatly save the calculation workload, improve the quality and efficiency of the simulation, and provide a theoretical basis for the analysis and management of stray currents.

[0077] Example 2

[0078] Based on the same inventive concept, the embodiment of the present disclosure also provides a system for equivalent fitting of rail transit stray current, including: a rail transit basic simulation model building unit, a train maximum step length calculation unit and a stray current fitting unit; wherein:

[0079] Rail transit basic simulation model building unit, used to build rail transit basic simulation model based on CDEGS software;

[0080] A train maximum step length calculation unit, used for simulating and calculating the train maximum step length according to the basic simulation model and a first preset rule;

[0081] The stray current fitting unit is used to fit the stray current within the step length according to the maximum step length of the train and a second preset rule.

[0082] Furthermore, the first preset rule at least includes:

[0083] S201. Obtain the number n of subway lines in the basic simulation model, wherein each subway line has a rail for an up line and a rail for a down line, and there are 2n rails in total, denoted as {G1, G2, ..., G 2n}, the rail length is recorded as {L1,L2,…,L 2n}, for any rail G i , 1≤i≤2n, the train movement step length is C;

[0084] S202. Obtain the maximum number of trains on 2n rails, denoted as {m1,m2,…,m 2n}, then for any rail, the relationship m i C≤L i , completing the setting of all trains on the rails according to the relationship;

[0085] S203. After all trains are set up on the rails, four verification intervals [J1, J2, J3, J4] are determined. For rail G i , if the positive maximum value appears at position p and the negative maximum value appears at position q, then the trains corresponding to the four verification intervals [J1, J2, J3, J4] are [p-1, p], [p, p+1], [q-1, q], [q, q+1] respectively, and the stray currents at the corresponding positions are divided into A p-1 , A p , A p+1 , A q-1 , A q , A q+1 ;

[0086] S204. Set the position of the conductor simulation train at intervals of preset lengths in the four verified sections. The conductor corresponding to section J1 is The conductor corresponding to the interval J2 is The conductor corresponding to the interval J3 is The conductor corresponding to the interval J4 is in

[0087] S205. After the conductor is set, the stray current is calculated and the stray currents of the four sections are obtained as follows: The error between the fitted value and the true value of each interval is calculated based on the stray current of the four intervals.

[0088] S206. Based on the error between the fitting value and the true value Get the maximum step size of the train.

[0089] Among them, other specific working principles of the rail transit basic simulation model building unit, the train maximum step length calculation unit and the stray current fitting unit have been described in detail in Example 1, and will not be repeated in this embodiment.

[0090] Example 3

[0091] Based on the same inventive concept, an embodiment of the present disclosure also provides an electronic device. Figure 3 FIG. 1 is a schematic diagram of the structure of an electronic device according to an embodiment of the present disclosure. Figure 3 As shown, an embodiment of the present disclosure provides an electronic device including: one or more processors 101, a memory 102, and one or more I / O interfaces 103. The memory 102 stores one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement any optimization method in the above embodiments; the one or more I / O interfaces 103 are connected between the processor and the memory, and are configured to implement information interaction between the processor and the memory.

[0092] Among them, the processor 101 is a device with data processing capabilities, including but not limited to a central processing unit (CPU), etc.; the memory 102 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory (FLASH); the I / O interface (read-write interface) 103 is connected between the processor 101 and the memory 102, and can realize information interaction between the processor 101 and the memory 102, including but not limited to a data bus (Bus), etc.

[0093] In some embodiments, the processor 101 , the memory 102 , and the I / O interface 103 are connected to each other via a bus 104 , and further connected to other components of the computing device.

[0094] In some embodiments, the one or more processors 101 include a field programmable gate array.

[0095] According to an embodiment of the present disclosure, a computer-readable medium is further provided, wherein a computer program is stored on the computer-readable medium, wherein when the program is executed by a processor, the steps in any optimization method in the above-mentioned embodiment are implemented.

[0096] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0097] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0098] Those skilled in the art will also appreciate that the various illustrative logic blocks, modules, circuits, and algorithmic steps described in conjunction with the embodiments herein can all be implemented as electronic hardware, computer software, or a combination thereof. In order to clearly illustrate the interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above around their functions. Whether such functions are implemented as hardware or software depends on specific applications and the design constraints imposed on the entire system. A skilled person can implement the described functions in an alternative manner for each specific application, but such implementation decisions should not be interpreted as departing from the scope of protection of the present disclosure.

[0099] The steps of the method or algorithm described in conjunction with the embodiments herein may be directly embodied as hardware, a software module executed by a processor, or a combination thereof. The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a mobile disk, a CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is connected to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The ASIC may be located in a user terminal. Of course, the processor and the storage medium may also be present in a user terminal as discrete components.

[0100] For software implementation, the techniques described in this application can be implemented with modules (e.g., procedures, functions, etc.) that perform the functions described in this application. These software codes can be stored in a memory unit and executed by a processor. The memory unit can be implemented within the processor or outside the processor. In the latter case, it is coupled to the processor in a communication manner via various means, which are well known in the art.

[0101] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. A method for equivalent fitting of stray current in rail transit, characterized in that: include: S100. Build a basic rail transit simulation model based on CDEGS software; S200. According to the basic simulation model, the maximum step length of the train is calculated by simulation according to the first preset rule; The first preset rule at least includes: S201. Obtain the number n of subway lines in the basic simulation model, wherein each subway line has a rail for an up line and a rail for a down line, and there are 2n rails in total, denoted as {G1, G2, ..., G 2n }, the rail length is recorded as {L1,L2,…,L 2n }, for any rail G k , 1≤k≤2n, the train movement step length is C; S202. Obtain the maximum number of trains on 2n rails, denoted as {m1,m2,…,m 2n }, then for any rail, the relationship m k C≤L k , completing the setting of all trains on the rails according to the relationship; S203. After all trains are set up on the rails, four verification intervals [J1, J2, J3, J4] are determined. For rail G k , if the positive maximum value appears at position p and the negative maximum value appears at position q, then the trains corresponding to the four verification intervals [J1, J2, J3, J4] are [p-1, p], [p, p+1], [q-1, q], [q, q+1] respectively, and the stray currents at the corresponding positions are divided into A p-1 , A p , A p+1 , A q-1 , A q , A q+1 ; S204. Set the position of the conductor simulation train at intervals of preset lengths in the four verified sections. The conductor corresponding to section J1 is The conductor corresponding to the interval J2 is The conductor corresponding to the interval J3 is The conductor corresponding to the interval J4 is in S205. After the conductor is set, the stray current is calculated and the stray currents of the four sections are obtained as follows: The error between the fitting value and the true value of each interval is calculated based on the stray current of the four intervals. S206. Based on the error between the fitting value and the true value Get the maximum step length of the train; S300. According to the maximum step length of the train, the stray current within the step length is fitted according to the second preset rule; the specific method of the second preset rule includes: obtaining the maximum step length C of the train max And verification interval segment, when the verification interval segment is [p, p+1], the stray current calculation formula at any point within the step size is: Among them A j is the current of any point j in the interval [p, p+1], S is the distance from point j to position p in the interval, The maximum step length C max The stray current at positions p and p+1.

2. A method for equivalent fitting of rail transit stray current according to claim 1, characterized in that: In S100, a basic simulation model of rail transit is built based on the MALZ module of CDEGS software, and the basic simulation model at least includes a conductor model, a substation grounding grid model, a transformer model, a contact network model, a rail model, a drainage network model, a traction station model and a train model.

3. A method for equivalent fitting of rail transit stray current as claimed in claim 2, characterized in that: In the traction station model and the train model, the traction station shares a busbar, each train has a busbar, and the excitation of the traction station is equal to the sum of the excitations of all trains, but in opposite directions.

4. A method for equivalent fitting of rail transit stray current according to claim 1, characterized in that: In S205, the error between the fitting value and the true value The calculation formula includes: Among them, A p-1 , A p , A p+1 , A q-1 , A q , A q+1 are the stray currents at the positions of [p-1, p], [p, p+1], [q-1, q], [q, q+1] corresponding to the trains in the intervals [J1, J2, J3, J4], respectively. C is the train movement step length, and D 1,i , D 2,i , D 3,i and D 4,i They are the conductors corresponding to the intervals J1, J2, J3 and J4 respectively.

5. The method for equivalent fitting of rail transit stray current according to claim 1, characterized in that: In S206, according to the error between the fitting value and the true value The maximum step length of the train is obtained by: The error threshold YZ between the fitted value and the true value of the simulation is used to judge. If it satisfies Where YZ is the error threshold between the fitted value and the true value of the simulation, then the maximum step length C max =C, then set C=C+1, and then repeat the above S202-S205; If not satisfied Then determine whether the maximum step length is empty. If it is not empty, end the calculation, C min That is the maximum step length; when the maximum step length is empty, let C=C-1, and then repeat S202-S205 until the maximum step length is obtained.

6. A system for equivalent fitting of stray current in rail transit, characterized in that: include: Rail transit basic simulation model building unit, train maximum step length calculation unit and stray current fitting unit; among which: Rail transit basic simulation model building unit, used to build rail transit basic simulation model based on CDEGS software; The train maximum step length calculation unit is used to simulate and calculate the maximum step length of the train according to the basic simulation model and a first preset rule; the first preset rule at least includes: S201. Obtain the number n of subway lines in the basic simulation model, wherein each subway line has a rail for an up line and a rail for a down line, and there are 2n rails in total, denoted as {G1, G2, ..., G 2n }, the rail length is recorded as {L1,L2,…,L 2n }, for any rail G k , 1≤k≤2n, the train movement step length is C; S202. Obtain the maximum number of trains on 2n rails, denoted as {m1,m2,…,m 2n }, then for any rail, the relationship m k C≤L k , completing the setting of all trains on the rails according to the relationship; S203. After all trains are set up on the rails, four verification intervals [J1, J2, J3, J4] are determined. For rail G k , if the positive maximum value appears at position p and the negative maximum value appears at position q, then the trains corresponding to the four verification intervals [J1, J2, J3, J4] are [p-1, p], [p, p+1], [q-1, q], [q, q+1] respectively, and the stray currents at the corresponding positions are divided into A p-1 , A p , A p+1 , S204. Set the position of the conductor simulation train at intervals of preset lengths in the four verified sections. The conductor corresponding to section J1 is The conductor corresponding to the interval J2 is The conductor corresponding to the interval J3 is The conductor corresponding to the interval J4 is in S205. After the conductor is set, the stray current is calculated and the stray currents of the four sections are obtained as follows: The error between the fitting value and the true value of each interval is calculated based on the stray current of the four intervals. S206. Based on the error between the fitting value and the true value Get the maximum step length of the train; The stray current fitting unit is used to fit the stray current within the step length according to the maximum step length of the train according to the second preset rule; the specific method of the second preset rule includes: obtaining the maximum step length C of the train max And verification interval segment, when the verification interval segment is [p, p+1], the stray current calculation formula at any point within the step size is: Among them A j is the current of any point j in the interval [p, p+1], S is the distance from point j to position p in the interval, The maximum step length C max The stray current at positions p and p+1.

7. An electronic device comprising: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 5.

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